Lawn mower

ABSTRACT

A lawn mower, wherein the cutter system of the lawn mower needs to judge whether the start pulse and the start signal of the cutter switch are valid at the same time under the condition that the seat switch is closed, and the cutter system will be started, only the two conditions are met at the same time, thus not only improving the safety when the cutter system is started, but also the startup of the cutter system can be completed automatically, saving time and labor, and reducing the operator&#39;s operation difficulty.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a US application which claims the priority of CN Application Serial No. 201811367370.3, filed on Nov. 16, 2018, the disclosures of which are hereby incorporated by reference in their entirety.

TECHNICAL FIELD

The present invention relates to a lawn mower.

BACKGROUND

Lawn mower is a dedicated equipment for mechanically mowing the lawn. Because it is a dedicated equipment, the lawn mower has a sharp blade. The sharp blade is in a high-speed rotation state when working. Therefore, in order to ensure safety, the lawn mower must be able to start normally under restricted safety conditions, otherwise it will cause a danger that is difficult to predict.

At present, the starting condition of the cutter switch of a mower on the market is: the whole machine is turned off if the driver leaves when the cutter is in the starting state, and the whole machine is restarted to continue to work after the driver sits on the seat again, the operation is relatively cumbersome, and frequent startup will also affect efficiency.

In view of this, it is indeed necessary to make further improvements to the current startup of a cutter switch to solve the above problems.

SUMMARY OF INVENTION

It is an object of the present invention to provide a lawn mower that saves time and effort when starting the cutter system of the lawn mower, and can reduce the operator's operational difficulty.

To achieve the above object, the present invention provides a lawn mower comprising: a battery system, which is configured to provide power to said lawn mower; a walking system, comprising a walking wheel and a self-propelled motor for driving the walking wheel to self-propelled; a cutter system, comprising a blade, a drive motor for driving the blade to rotate, a start switch for activating said cutter system, an seat switch, and a cutter switch; said cutter system starts to work when the seat switch is closed and both the start pulse and the start signal of the cutter switch are valid.

In some embodiments, when said seat switch is closed, said start switch is closed, and said cutter system is powered on; when said seat switch is switched off, said start switch is switched off, and said cutter system is powered off.

In some embodiments, said start switch is a contactor.

In some embodiments, said cutter system further comprises a high-low speed cutter switch for controlling the rotational speed of said blade, when the cutter system starts to work, if the high-low speed cutter switch is active, the blade rotates at a high speed; if the high-low speed cutter switch is inactive, the blade rotates at a low speed.

In some embodiments, the start pulse of said cutter switch comprises a rising edge and a falling edge, and the start signal of the cutter switch comprises a low level input and a high level input.

In some embodiments, if the start signal of the cutter switch is valid when using a low level input, and the start pulse of the cutter switch is valid when it is a falling edge, the cutter system is activated.

In some embodiments, if the start signal of the cutter switch is valid when using a high level input, and the start pulse of the cutter switch is valid when it is a rising edge, the cutter system is activated.

In some embodiments, when the start pulse of the cutter switch is a rising edge, the pulse clock signal CLK transitions from 0 to 1; when the start pulse of the cutter switch is a falling edge, the pulse clock signal CLK transitions from 1 to 0.

In some embodiments, when the start signal of the cutter switch is a high level input, the pulse clock signal CLK is 1; when the start signal of the cutter switch is a low level input, the pulse clock signal CLK is 0.

The beneficial effects of the present invention are: the lawn mower in the invention needs to judge whether the start pulse and the start signal of the cutter switch are valid at the same time under the condition that the seat switch is closed, and only the two conditions are satisfied at the same time, the cutter system will start, thus not only increasing the safety factor when the cutter system is started, but also the startup of the cutter system can be completed automatically, saving time and labor, and reducing the operator's operation difficulty.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a flow chart showing a start method of a cutter system of a lawn mower in the present invention.

FIG. 2 is a schematic diagram of the start signal and start pulse of the cutter switch.

DESCRIPTION OF EMBODIMENTS

In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the drawings and specific embodiments.

The invention provides a lawn mower mainly comprising a battery system, a walking system and a cutter system. The battery system is configured to provide power to the lawn mower; said walking system comprises a walking wheel and a self-propelled motor mainly used for driving the walking wheel, and is used for driving the lawn mower to perform self-propelling; said cutter system comprises a blade, a drive motor for driving said blade to rotate, a start switch for activating the cutter system, an seat switch, a cutter switch, and a high-low speed cutter switch for controlling the rotational speed of said blade. Of course, said lawn mower further comprises other structures, such as a control system, a control lever, a casing, etc., and these structures will not be described in detail herein, since they are prior arts.

When the cutter system is activated, said cutter system starts to work if the seat switch is closed and both the start pulse and the start signal of the cutter switch are valid. When the cutter system starts to work, the blade enters into a high speed mode and rotates at a high speed if the high-low speed cutter switch is active; the blade enters into a low speed mode and rotates at a low speed if the high-low speed cutter switch is inactive.

Of course, said start switch is closed, and said cutter system is powered on if said seat switch is closed; and said start switch is turned off, said cutter system is powered off if said seat switch is turned off when said cutter system is activated. In this embodiment, said lawn mower is preferably a driving type lawn mower, said start switch is a contactor, and the control system controls the contactor to be closed, and the cutter system is powered on when the seat switch is closed; the control system controls the contactor to open and the cutter system is powered off when the seat switch is turned off.

Said seat switch generally implements a function in which the seat switch is in a closed state when the operator is present, and the seat switch is in an off state when the operator is absent. For example, the seat switch can be placed under the seat, and the seat switch can be pressed by operator's gravity when the operator sits on the seat; the seat switch is turned off, and then the start switch is turned off and the cutter system is stopped when the operator leaves the seat halfway; the seat switch is closed, and then the start switch is closed and the cutter system is started when the operator sits back on the seat. Of course, it is also possible to place the seat switch on other parts than the seat, such as the left or right side of the operator, or the front joystick. In addition, the seat switch may be a switch having infrared induction as long as it can realize a function of switching on when the operator is present and switching off when the operator leaves.

In addition, when said cutter system is started, if one of the start pulse and the start signal of the cutter switch is invalid, the cutter system is stopped until the seat switch is closed and the start pulse and the start signal of the cutter switch are simultaneously valid, then the cutter system will restart.

If one of the battery system, the walking system, and the cutter system breaks down, the cutter system stops and the blade does not rotate. Only after the fault is removed, the state of the seat switch, the start pulse and the start signal of the cutter switch can be rejudged. Repeat in this way, the cutter system will not start until the start condition is met.

In the following, the contactor is taken as an example to describe the starting method of the cutter system in detail, but it should not be limited thereto.

Please refer to FIG. 1, the starting method of the cutter system mainly includes the following steps:

S1. After power-on, the lawn mower performs self-test of the whole machine, and the whole machine stands by after the self-test passes;

S2. Judging whether there is a fault in the battery system and the walking system in the standby state of the whole machine, if yes, the cutter system stops and proceeds to step S1 after the fault is removed, and if not, continue to the next;

S3. Determine whether the seat switch is closed, if not, the cutter system stops, and the contactor is switched off, and if yes, the contactor is switched on;

S4. Judging whether there is a fault in the cutter system, if yes, the cutter system stops and proceeds to step S2 after the fault is removed, and if not, continue to the next;

S5. Determining whether the start pulse and the start signal of the cutter switch are valid at the same time. If not, the cutter system stops and loops to step S3, and if yes, continue to the next;

S6. Determine whether the high-low speed cutter switch of the cutter is active. If yes, the cutter system activates and operates in a high speed mode. If not, the cutter system activates and operates in a low speed mode.

Specifically, in step S1, when the lawn mower performs the self-test of the whole machine, if there is a fault, the power will be turned off and the process proceeds to step S1 until the self-test passes.

In step S5, the start pulse of said cutter switch comprises a rising edge and a falling edge, and the start signal of the cutter switch includes a low level input and a high level input.

After step S6, if the seat switch is turned off, the contactor is switched off, and the cutter system is automatically stopped. It will be rejudged that whether the start pulse and the start signal of the cutter switch are both valid, and whether the cutter system can be activated until the seat switch is re-closed and the contactor is switched on. That is to say, even if the cutter system is in the startup state, the control system will monitor the state of the seat switch in real time to achieve the effect of stopping the cutter system when the operator leaves, and it is unnecessary to start the whole machine when the cutter system is restarted.

Please refer to FIG. 2, the on/off action of the cutter switch can be captured through the value changes of the pulse clock signal CLK when the start pulse of the cutter switch is a rising edge or a falling edge, and the valid start signal of the cutter switch is a low level or a high level in the normal case.

In general, when the start pulse of the cutter switch is a rising edge, the pulse clock signal CLK transitions from 0 to 1; when the start pulse of the cutter switch is a falling edge, the pulse clock signal CLK transitions from 1 to 0; when the start signal of the cutter switch is a high level, the pulse clock signal CLK is 1; when the start signal of the cutter switch is a low level, the pulse clock signal CLK is 0.

There are many ways to determine whether the cutter switch is switched on or off by the change of the value of the pulse clock signal CLK. The following part of the specification will illustrate three of them by examples, but it should not be limited thereto.

Method 1: define the start signal of the cutter switch to be active low (1), then determine the starting condition of the cutter system through a falling edge and the low level state of the cutter switch. the falling edge of the low level of State the cutter switch the cutter switch the cutter system stops 0 0 the cutter system stops 1 0 the cutter system stops 0 1 the cutter system works 1 1

It can be seen from the above table that when the cutter switch is invalid low level (0), the cutter system is in the stop state regardless of whether the falling edge of the cutter switch is active (1) or inactive (0); when the cutter switch is active low (1), if the falling edge of the cutter switch is inactive (0), the cutter system is still in the stop state; when the cutter switch is active low (1), if the falling edge of the cutter switch is active (1), the cutter system will be activated.

We can conclude from the above table that: if the start signal of the cutter switch is active low (1), and the valid start pulse of the cutter switch is a falling edge (1), the cutter system is activated.

Method 2: define the start signal of the cutter switch to be active high (1), then determine the starting condition of the cutter system through a rising edge and the high level state of the cutter switch. the rising edge of the high level of State the cutter switch the cutter switch the cutter system stops 0 0 the cutter system stops 1 0 the cutter system stops 0 1 the cutter system works 1 1

It can be seen from the above table that when the cutter switch is invalid high level (0), the cutter system is in the stop state regardless of whether the rising edge of the cutter switch is active (1) or inactive (0); when the cutter switch is active high level (1), if the rising edge of the cutter switch is invalid (0), the cutter system is still in the stop state; when the cutter switch is active high level (1), if the rising edge of the cutter switch is valid (1), the cutter system will be activated.

We can conclude from the above table that: if the start signal of the cutter switch is active high (1), and the valid start pulse of the cutter switch is a rising edge (1), the cutter system is activated.

Method 3: redundancy control is performed with two or more cutter switches. One cutter switch is active high (1), and the other cutter switch is active low (1). It is also adoptable to use the rising or falling edge and the high and low state detection of the cutter switch to determine the starting condition of the cutter system. the rising the high the falling the low edge of level of edge of level of the cutter the cutter the cutter the cutter State switch switch switch switch the cutter 0 0 0 0 system stops the cutter 1 0 1 0 system stops the cutter 0 1 0 1 system stops the cutter 1 1 1 1 system works

It can be seen from the above table that the third method is the combination of the foregoing method 1 and method 2. Therefore, it can be concluded that when the cutter switch is active high (1), the corresponding valid start pulse is a rising edge (1), as well as, the cutter switch is active low (1), the corresponding valid start pulse is a falling edge (1), the cutter system will start; otherwise, the cutter system remains in stopped status.

It can be seen that the lawn mower of the present invention can capture the switch-on and switch-off actions of the cutter switch by the rising and falling edges which are used to detect the switch-on and switch-off actions of the cutter switch, thereby only when the “seat switch is switched on”, the start pulse and the start signal of the cutter switch can be judged, and the cutter system can only be started when the start pulse and the start signal of the cutter switch are simultaneously valid. In other words, the cutter system can only be started properly when the order in which the switch is closed is met.

In summary, the beneficial effects of the present invention are: the lawn mower in the invention needs to judge whether the start pulse and the start signal of the cutter switch are valid at the same time under the condition that the seat switch is closed, and only the two conditions are satisfied at the same time, the cutter system will start. After the cutter system stops halfway, it is not necessary to restart the whole machine. Directly judge the state of the seat switch, and sequentially enter the next action. In this way, not only increasing the safety factor when the cutter system is started, but also the startup of the cutter system can be completed automatically, saving time and labor, and reducing the operator's operation difficulty.

The above embodiments are only used to illustrate the technical solutions of the present invention, not for limitation. Although the present invention is described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solutions of the present invention may be modified or substituted without departing from the spirit and scope of the technical solutions of the present invention. 

We claim:
 1. A lawn mower, comprising: a battery system, which is configured to provide power to said lawn mower; a walking system, comprising a walking wheel and a motor for driving the walking wheel; a cutter system, comprising at least one blade, at least one drive motor for driving said blade to rotate, a start switch for activating said cutter system, an seat switch, and a cutter switch; said cutter system starts to work when the seat switch is closed and both the start pulse and the start signal of the cutter switch are valid.
 2. The lawn mower according to claim 1, wherein said start switch is closed, and said cutter system is powered on when said seat switch is closed; said start switch is switched off, and said cutter system is powered off when said seat switch is switched off.
 3. The lawn mower according to claim 2, wherein said start switch is a contactor.
 4. The lawn mower according to claim 1, wherein said cutter system further comprises a high-low speed cutter switch for controlling the rotational speed of said blade, when the cutter system starts to work, the blade rotates at a high speed if the high-low speed cutter switch is active and the blade rotates at a low speed if the high-low speed cutter switch is inactive.
 5. The lawn mower according to claim 1, wherein the start pulse of said cutter switch comprises a rising edge and a falling edge, and the start signal of the cutter switch comprises a low level input and a high level input.
 6. The lawn mower according to claim 5, wherein the cutter system is activated if the valid start pulse of the cutter switch is a falling edge when the valid start signal of the cutter switch is a low level input.
 7. The lawn mower according to claim 5, wherein if the start signal of the cutter switch is valid when using a high level input, and the start pulse of the cutter switch is valid when it is a rising edge, the cutter system is activated.
 8. The lawn mower according to claim 5, wherein the pulse clock signal CLK transitions from 0 to 1 when the start pulse of the cutter switch is a rising edge; the pulse clock signal CLK transitions from 1 to 0 when the start pulse of the cutter switch is a falling edge.
 9. The lawn mower according to claim 8, wherein the pulse clock signal CLK is 1 when the start signal of the cutter switch is a high level input; the pulse clock signal CLK is 0 when the start signal of the cutter switch is a low level input. 